Because Haste (Yellow Gem) & Dodge (Yellow Gem) are important, a good mix of Crit (Yellow Gem) and Crit Power (Blue Gem) is Crit 35% and Crit Power 183- 190%.

Crit Power 190% takes twice the Crit Power Rating as 183%, and increases Average Damage Per Second by 2.5% useful for Regular Raids (can use Health Potions). Crit Power 183% allows more of the remaining Blue Gems for Phys Resist and Magic Resist both useful in Onslaught (Health Potions in cool down) but very useful in PvP (no Health Potions).